which are the following are true about the expansion of (x+y)^8? a. the sum of the powers of x and y in any terms is 8. b. the numbers of terms in the expansion is 9. c. the coefficient of x^4y^4 is 56 d. the sum of the numerical coefficient is 2^8 a. (a,b and c)   b.  (a and b)   c. (a,b,c, and d)   d. (a,b and d)

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